Electric metal-working apparatus.



Patented Apr. 3, I900. 12. L. CO'FFIN. ELECTRIC METAL WORKING APPARATUS.

(Application flied May 18, 1899.)

3 Sheets-Sheet I.

(No Model.)

IJVVENTOR 672a 7-7es L, COjfiit I l/ I I I M Attorneys WITJZEDSSE; 6 i.I I 30 THE NORRIS FUSES co. PHOYoumQ. wAsmNuTom n. c.

N0. 646,619. Patented Apr. 3, 1900. c. L. COFFIN.

ELECTRIC METAL WORKING APPARATUS.

A lication flied May 13. 1899.)

3 Sheets-Sheet 2.

(No Model.)

INVENTOR. 672612463 lcyf H0. 646,6|9. Patented Apr. 3, I900.

' C. L. CUFFIN.

ELECTRIC METAL WORKING APPARATUS.

(Application filed May 13. 1899.) (No Modal.) 3 Shaets-Sheet a.

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THE NORRIS PETER5 c0 vrlcmumo. WASHINGTON, a. c.

UNITED STATES PATENT OFFICE.

CHARLES L. COFFIN, OF DETROIT, MICHIGAN.

ELECTRIC METALI-W ORKING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 646,619, dated April 3,1900.

Application filed May 13, 1899.

To (LN, 1071/0772, it 717,611.11 concern:

Be it known that I, CHARLES L. COFFIN, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Machines forElectrically Heating, \Velding, or Working Metals, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

The invention consists in the construction of a machine for electricallyheating, welding, or working metals; and it consists particularly in theconstruction, arrangement, and combination of the parts, as more fullyhereinafter described, and specifically pointed out in the claims.

In the drawings,,Figure 1 is a front elevation of my machine, having thescreen partially broken away to show more clearly the position of theelectrode. Fig. 2 is a side elevation of the machine shown in Fig. 1.Fig. 3 is a top plan view thereof.

A represents the base of the machine, which may be of any suitableconstruction.

B is theclamp-carriage, supported in ways at the top of the frame at thefront and adjustable transversely of the machine by means of thescrew-shaft D, suitably engaging a hearing thereon and supported in thebracket E and having a hand-wheel F for turning it.

Upon the clamp-carriage are supported the two blocks B, sliding insuitable guides or ways therein, as plainly shown in Fig. 2. The blocksB carry the lower or stationary jaws K K of a pair of clamps the uppermembers of which are shown at J J; The jaws J J are adjustably securedupon rock-shafts m on the blocks 13 and have actuating arms or levers Jextending rearwardly therefrom and into operative relation to the leversb I). These levers are secured to the rock-shaft c, which is j ournaledin brackets to a and is con nected by the connecting-rod n to thefootlever 6, supported in the bracket d. One or both of the blocks B maybe adjustable upon the clamp-carriage, and in this case I have shownonly the right-hand block carrying the jaws K J as adjustable by meansof a screwshaft G, actuated by the hand-Wheel H and supported and guidedin the bracket I. By

Serial No. 716,736. (No model.)

this means the distance between the pairs of jaws maybe varied at will.

0 is a bracket movable in ways in the frame of the machine transverselyto the line of movement of the clamp-carriage. The adjust ment I haveshown I accomplish by means of the threaded shaft Q, operated by thehand wheel R, supported in the bracket S, Fig. 2. At the forward end ofthe bracket 0, I secure aguide L, insulated from the bracketand in whichis slidingly supported the elect-rodecarrier N, having at its lower enda chuck T, which carries an electrode U. The electrodecarrier N at itsupper end is connected to the actuating-lever O, which has a suitableinsulated handle 0" and a'counterweight k at the opposite end. The leverO is fulcrumed in the bracket P, as shown in, Fig. 2.

his a screen which is actuated synchronously with the electrode U,preferably by the following connections: The screen it is supported atthe forward end of the lever g, which in turn is fulcrumed upon the pinZ upon the brackets 'i. The lever g is 'connected to the lever O by theconnecting-rodf.

The parts being thus constructed, the operation of the device is asfollows: The end portions of the metal to be united are placed on thelower jaws K K of the clamp, with the ends abutting and as nearly aspossible in trode U. The operator then depresses the foot-lever e,which, through the connection described,lowers the jawsJ J upon themetal, whichlhave lettered M. If the joint to be welded is not inalinement with the electrode, the hand-wheel F may be actuated,movingthe clampcarriage in either direction until .the joint has been broughtexactly in line with the axis of the electrode. If the central verticalplane of the metal at the point of juncture should be out of alinementwith the axis of the electrode, the threaded shaft Q. may be actuated bythe hand-wheel B, so as to move the electrode-support 0 forward orbackward until the axis of the electrode U is in the desired verticalplane with regard to the metal M. hen the proper adjustments have beenmade, so that the electrode U is directly above the joint, the operatordepresses the electrode into contact with the metal, which thuscomalinement with the vertical axis of the elec-.

pletes the electric circuit. The depression of the lever likewise lowersthe screen 71. in position in front of the work, so that the operatormay inspect the work through the screen, which is usually colored glass.The operator now slightly raises the lever 0, so as to form a small arethrough it and the metal to be welded, and retains the lever in thisposition until the proper temperature is obtained. The hand-wheel II maythen, if desired, be turned, which will move one pair of clamps towardthe other a sufficient distance to squeeze the parts together at thejoint or, it necessary, to upset the metal. The operator nowreleasinghis hold of the lever O,the counterweight 7.; will return theparts to their normal position and also threw the screen up out of theway. The operator then removes his foot from the lever E and removes thework from the clamps. The jaws are separated as soon as the pressure isremoved from the treadle e by the action of the spring \',which rocksthe levers l) I), lowering the forward ends thereof and permitting thearms J to fall by gravity, thereby raising the upper jaw.

It will be seen that the counterweight]; will normally hold theelectrode away from the work, and through the multiplying-lever g thescreen It will not only clear the work, but

will be drawn up a considerably-greater distance than the electrode, soas to clear the electrode. This not only draws the screen away from thework, so that the operator can readily get at it or the jaws, but alsoclears the electrode, so that it may be replaced or adjusted at anytime. The terminals of the electric circuit are connected, respectively,to the binding-screws X and Y. (Shown in Fig. 2.)

'What I claim as my invention is 1. In a machine for electricallyheating, welding and working metals, the combina tion of a base, aclamp-carriage, ways across the front of the machine in which saidcarriage is adjustable, the blocks 13, adjustable longitudinally on saidcarriage to and from each, other, a stationary jaw and a movable jawsupported on each block, and an actuating device for the movable jaws onthe base, at all points of adjustment thereof.

2. In a machine for electrically heating, welding and working metals,the combination of the clamp-carriage movable in ways across the frontof the machine, the blocks 13 on the carriage, means for adjusting theblocks to and from each other longitudinally of the carriage, thestationary jaws on the blocks, the rock-shafts on the blocks, the

movable jaws secured to the rock-shafts, an actuating-arm extending outfrom each rockshaft, a rock arm or lever for each jaw-actuating arm, anda common actuating device for the last-mentioned levers.

3. In a machine for electrically heating,

welding or working metals, the combination of work-clamps, connected toone terminal 01' a source of electrical energy,an l an electrodeconnected to the other terminal of relative longitudinal and transverseadjustments between the clamps and electrode, and means for moving theelectrode and work to and from each other.

-l-. In an apparatus for heating,welding and working metalselectrically, the con'lbination with a base, a clamp-carriage movableacross the front of the base,two pairs of clamps thereon, means foradjusting said pairs 01: clamps to and from each other longitudinally ofthe carriage, the said clamp being connected to one terminal of thesource of electric energy, a bracket adjustable at right angles to theadjustment of the clamps, and a verticallymovable electrode connected tothe other electric terminal, on said bracket.

5. In a machine for electrically welding metals, the combination with abase, of two pairs ot' clamps adapted to hold the ends of the parts tobe joined in contact-,an electrode, the terminals of a source ofelectricalencrgy being connected respectively to the clamps and theelectrode, a screw-shaft t'or adj usting the clamp-carriagelongitudinally of the base, a bracket in which the electrode issupported,a screw-shaft i'or adj usti ng the bracket across the path ofmovement of the clamp carriage and a counterweighted lever for in oringthe electrode vertically in the bracket.

6. In a machine for electrically welding or working metals, thecombination of: a workholder, a lever :t'or moving the arc-formingmechanism into operative relation to the work, a screen and means formoving the screen differentially from and synchronously with saidarc-forming mechanism.

7. In a machine for electrically welding or working metals, thecombination of a workholder, connected to one terminal of the current, amovable electrode connected to the other terminal, a lever for actuatingthe elec trode a screen and mechanism for movingthe screen away from thework and the carbon.

8. In a machine for electrically welding or working metals, thecombination of a workholder connected to one terminal of the current, amovable electrode connected to the other terminal, a connterweightedlever to which the electrode is connected and by means of which it isactuated, a screen, a multiplying-lever upon which the screen is securedanda connection between the screensupport ing lever and thecounter-weighted lever for the purpose described.

In testimony whereof I al'iix my signature in presence of two witnesses.

CHARLES L. COFFIN.

Witnesses:

.Lnuns Writr'rnnoan, M. B. ODod-rtnntrv.

